Piston



.patented allan. l?, 192.

in it @ai HARRY SGEN MATER, 0F CllNGlfNNATll, H, ASSEGNE, BY MESH@ ASSIGNMENTS, T@

THE CLEVELAND TRUST GUMPMFY, 02E CLEVELAND, @REGL appiicauoa aiea september it, iena. semi no. seam. il,

My invention relates to pistons of' the type generally used in internal combustion engines, the piston comprising generally a solid head portion and a skirt or tubular portion u extending from the head portion.

rlhe object of my invention is construct a piston which will not be expensive manufacture; which will it efficiently in .the cylinder without scoring or otherwise injuring it; which will tit in the cylinder with less clearance than is necessary in other istons; which will not knock, slap or c atte1 which will have a uniform lit in the cylinder throughout its circumference; which will function properly at all speeds of the motor; which will not cave in; which will not spring on the thrust side of the motor when subjected to load, and which willbe perfectly lubricated. With these and further objects in view, one embodiment of my invention is shown in the accompanying drawing in which Figure 1 is an elevation of my piston; Figure 2 is a section on line 2 2 of Figure 1;

,Figure 3 lis an elevation with the piston turned 90 degrees from'the position shown in Figure 1;

Figure 4 is a section on line 1 -4:v of Figure 3; and

Figure 5 is a section on line 5-5 of Figure 1. M soli piston designated 'as ya whole by 1 has a head 2 and a depending hollow skirt 3. The head contains the usual piston ring grooves 4, three being shown. The head below the lower groove -vis slightly beveled, shown accentuated in the drawing at 5, to' enable the oil which reaches this part .of the o head to drain back through the relief oi'l holes and the transverse slits in' the skirt of the piston. The metal of the skirt portion is cut away at 6 in the form of a key stone around the piston pin opening 7. Oil holes 5 8 are spaced around each piston pin opening within the key stone relief. A Atransverse slit 9 extends from just inside one'key stone relief to just inside the opposite key stone relief. A diagonal slit 10 extends from the transverse slit to a lower transverse slit 11 which is parallel, with the upper transverse slit and of practically the saine length. The transverse slits and diagonal slit are duplicates on opposite sides of the piston. Aver.- tical slit 12 extends from the bottom of the skirt substantially in line with the center of the piston pin opening to just within the key stone relie These diagonal s'lits are on op-A posite sides of the piston and are duplicates. rlFhe piston has the usual piston pin bosses 13. A rib 14 adjacent the lower part of the skirt extends around the inside circumference of the skirt disappearing' at the part directly below the piston in bosses. There may be openings l5 from t e inside of the piston to the bottom of the lower ring groove.

The construction described results in the production of a pair of resilient parts on 0pposite sides of the piston, degrees from the piston pin o enings. As these parts do not 70 extend to the ottom of the skirt of the piston, they will not be sprung out of ali ent, this being prevented by the uncut skirt portion below the bottom of the resilient parts. The vertical slits take care of the expansion of the piston, preventing scoring of the cylinder.

Havin described my invention, what I claim an desire to protect by Letters Patent 1S 2'- 1. A piston comprising ahead and depending skirt, said skirt having piston pin openings therein, said skirt having reliefs around said openings, said skirt having transverse slits therein, one of said transverse slits extending from a point within one relief to a point within the opposite relief, said skirt having a diagonal slit therein connecting said transverse slits and said skirt having a vertical slit therein extending from the bottom of said skirt to a point within said relief. 4

- 2. A piston comprising a head and dependingSkrt, said skirt having piston pin openings therein, said skirt having reliefs around said openings,y said skirt having transverse slits -therein on opposite sides of said skirt, one of each of said transverse slits extending from a point within onel relief to a point within the opposite relief, said skirt havin diagonal slits therein on opposite sides o said skirt connecting each pair of transverse slits, and said skirt having vertical slits` therein on opposite sides of said skirt extending from the bottom of said skirt to a point within said reliefs.

3. A piston comprising a head and depending skirt, said skirt having piston' pin openings therein, said skirt having reliefs around said openings, said skirt having` transverse n slits therein on opposite sides of said skirt, one of each of said transverse slits extending from a point within one relief to a point Within the opposite relief, said skirt having I dia onal slits therein on opposite sides of sai skirteconnecting each pair of transverse slits, and said skirt having vertical slits therein on Vopposite sides of said skirt extending from the bottom of said skirt to a point Within said reliefs, said vertical slits being placed substantially 90 degrees from a Vertical line extending,r from the bottom of said skirt through the middle point of said diagonal slits.

In testimony whereof I aiiix my signature.

HARRY JOHN HATER. 

